Iowa State House District 4

State Legislative District Profile (Lower Chamber)

Overview

District ID
ia-hd-004
State
Iowa
Chamber
Lower chamber
District Code
004
Land Area
930.6 sq mi
Water Area
0.3 sq mi

Boundary

Boundary of Iowa State House District 4

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Lyon County587.61 sq mi63.1%100.0%
Sioux County343.00 sq mi36.9%44.7%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Sioux Center city6.22 sq mi0.7%97.3%
Rock Valley city4.46 sq mi0.5%100.0%
Rock Rapids city4.21 sq mi0.5%100.0%
George city2.29 sq mi0.2%100.0%
Lester city1.82 sq mi0.2%100.0%
Inwood city1.42 sq mi0.2%100.0%
Hull city1.39 sq mi0.1%98.5%
Larchwood city1.04 sq mi0.1%100.0%
Little Rock city1.02 sq mi0.1%100.0%
Sheldon city0.71 sq mi0.1%14.9%
Doon city0.70 sq mi0.1%89.6%
Boyden city0.68 sq mi0.1%100.0%
Alvord city0.58 sq mi0.1%100.0%
Matlock city0.38 sq mi<0.1%100.0%

Showing all 14 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
IA District 431,733100.0%4.0%100.0%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
21,097
Active Voters
18,792 (89.1%)

Party Registration

PartyVotersShare
Democratic1,3526.4%
Republican16,10376.3%
Unaffiliated3,59317.0%
Other parties490.2%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20262,818 (13.4%)0 (0.0%)0 (0.0%)
2023–202417,397 (82.5%)53 (0.3%)5,065 (24.0%)
2021–202212,696 (60.2%)253 (1.2%)4,431 (21.0%)
2019–202015,661 (74.2%)517 (2.5%)7,970 (37.8%)
2017–201811,784 (55.9%)221 (1.0%)3,492 (16.6%)
2015–201613,152 (62.3%)109 (0.5%)2,997 (14.2%)
2013–20149,441 (44.8%)64 (0.3%)2,717 (12.9%)
2011–201211,484 (54.4%)55 (0.3%)2,162 (10.2%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 01/20/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
31,663 (± 654)
Median Age
35.2
Median Household Income
$81,907 (± $5,218)
High School Graduate or Higher (age 25+)
91.8%
Bachelor's Degree or Higher (age 25+)
25.1%

Population by Age

GroupPeopleShare
Under 188,60427.2%
18 to 6417,57655.5%
65 and over5,48317.3%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)3,53311.2%
White, not Hispanic27,26386.1%
Black, not Hispanic1290.4%
Asian, not Hispanic2080.7%
American Indian / Alaska Native, not Hispanic130.0%
Native Hawaiian / Pacific Islander, not Hispanic70.0%
Some other race, not Hispanic890.3%
Two or more races, not Hispanic4211.3%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
30,242
Citizen Voting Age Population (CVAP)
21,778

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic27,97592.5%
Hispanic2,2707.5%
White27,31790.3%
Black1380.5%
Asian1480.5%
American Indian / Alaska Native130.0%
Native Hawaiian / Pacific Islander60.0%
Two or More Races300.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic20,88795.9%
Hispanic8934.1%
White20,54194.3%
Black1470.7%
Asian1300.6%
American Indian / Alaska Native520.2%
Native Hawaiian / Pacific Islander70.0%
Two or More Races140.1%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).